A negative post tear test fixture

Abstract

The utility model discloses a kind of negative pole post tearing test tool, it is related to battery pole post test technical field, including pedestal and the fixture being set on pedestal, fixture includes the support being set on pedestal, two groups of clamping blocks being oppositely arranged are equipped on support, two clamping blocks are relatively movable, to generate adjustable and be used for clamping copper part or aluminum part's clamping area;Support is designed to slide on pedestal, when tension is applied to aluminum part or copper part, support can drive tearing point to move towards the direction of tension action line.The utility model is designed to be slidable on pedestal by support, and make the sliding direction and the tension direction associated, the position of the tool can be automatically adjusted clamp so that tearing point is always in or close to the center position of tension action line, realize centering arrangement, this kind of arrangement greatly eliminates eccentric load caused by initial clamping position deviation or uneven stress in testing process, improve the accuracy of test result.

Description

Technical Field

[0001] This utility model relates to the field of battery terminal testing technology, specifically to a negative terminal tear testing fixture. Background Technology

[0002] Current battery terminals are generally composed of two materials. For example, aluminum-copper composite negative terminals have become the mainstream choice for batteries in new energy vehicles and energy storage due to their significant comprehensive advantages, and continue to drive the advancement of related manufacturing processes. The interface between the aluminum and copper layers is the core of the overall material performance and reliability, requiring a strong metallurgical bond. Therefore, in the production process of aluminum-copper composite negative terminals, tear strength is a key indicator in quality inspection to determine whether the bonding strength of the negative terminal is up to standard.

[0003] A search revealed a patent document with authorization announcement number CN220367096U that discloses a pole welding tensile testing device. When using this testing device, the pole assembly is placed on the positioning plate, the screws inside the fixing block are tightened, and then the nuts on the screws are tightened to clamp the pole assembly horizontally. Then, the pressure block is pressed onto the pole assembly by screws. Finally, the position of the sliding plate on the base plate is adjusted and aligned with the clamps of the tensile testing machine. The position of the sliding plate is then locked with screws.

[0004] In order to meet the testing of the welding strength of the pole, the pole is omnidirectionally limited and fixed in both the horizontal and vertical directions in the above tensile testing device, and the pole maintains a constant position throughout the tensile process.

[0005] Since the aluminum-copper negative electrode post consists of a copper part at the top and an aluminum part at the bottom, its structural diagram can be drawn from... Figure 1 Let 101 represent the copper part, 102 represent the aluminum part, and d represent the through hole located on the copper part. When performing a tear test on this aluminum-copper negative electrode post, the tear path is arranged along the length of the contact surface between the copper and aluminum parts. Taking the aluminum part being fixed in position and the copper part being subjected to tensile tearing as an example, one type of tear path can be... Figure 1 The arrows in the diagram represent the tear. The beginning of the tear can be represented by 'a', and the end of the tear can be represented by 'b'. Under this tear path, the tension point can be represented by 'c'. During the tearing process, it is necessary to always keep the current tear point and the tension point in a centered relationship.

[0006] Based on the tear test characteristics of the aluminum-copper negative electrode mentioned above, if the welding tensile testing device in the prior art is directly applied to the tear test of the aluminum-copper negative electrode, the aluminum-copper negative electrode is omnidirectionally limited and fixed on the testing device, and the clamps of the tensile testing device are also adapted to move along the tear path direction. Therefore, during the tear test, the tension point of the clamps on the copper part cannot be dynamically aligned with the tear point at all times. Thus, it is difficult to meet the requirements of high-precision peel tear strength testing, and the resulting tear data will have large errors, or even cannot be used as an indicator for evaluation.

[0007] To address this issue, we propose a negative electrode post tearing test fixture. Utility Model Content

[0008] The purpose of this invention is to solve the problems in the prior art by proposing a negative electrode post tear test fixture. This test fixture can automatically compensate for the tear point position through the support sliding design, ensuring that the tensile force direction is aligned with the tear point, reducing test errors and improving test accuracy.

[0009] To solve the above problems, this utility model provides the following technical solution: A negative electrode post tear test fixture includes a base and a clamp on the base. The clamp includes a support on the base and two sets of opposing clamping blocks on the support. The two clamping blocks can move relative to each other to create an adjustable clamping area for clamping a copper or aluminum part. The support is designed to slide on the base. When a tensile force is applied to the aluminum or copper part, the support can drive the tear point to move in the direction of the tensile force line.

[0010] As a further embodiment of this utility model: the base is provided with a slide rail for sliding installation of the support, and the sliding direction of the support on the slide rail is parallel to the tear path direction.

[0011] As a further embodiment of this utility model: the two clamping blocks are defined as a fixed block and a moving block, respectively. The fixed block is fixedly installed on the support, and the moving block is movably installed on the support. The moving block can move toward or away from the fixed block to form the clamping area.

[0012] As a further embodiment of this utility model: the moving block is provided with an oblong hole, and the moving block is sleeved on the outside of the pin on the support by means of the oblong hole. The length direction of the oblong hole is perpendicular to the length direction of the fixed block, so that the moving block has a margin of movement to move toward or away from the fixed block.

[0013] As a further embodiment of this utility model: the support is provided with screws so that when the moving block and the fixed block are in contact with the copper or aluminum part on the same side, the screws can tighten to apply a force to the moving block toward the fixed block, so that the moving block presses the copper or aluminum part against the fixed block.

[0014] As a further embodiment of this utility model: the pin is configured as a bolt threaded onto the support, so that when the moving block presses the copper or aluminum part against the fixed block, the bolt can be tightened to lock the moving block onto the support by its head.

[0015] As a further embodiment of this utility model, the adjacent sides of the fixed block and the moving block are both designed with toothed knurling.

[0016] As a further embodiment of this invention, the testing fixture also includes a pull stud that can be inserted from bottom to top through a through hole in the copper part, the pull stud being used for clamping and fixing with clamps.

[0017] As a further embodiment of this utility model, the testing fixture also includes an adapter block installed at the bottom of the base. The adapter block is used for clamping and fixing by another clamp. The adapter block, the tear start end, and the line of action of the tensile force are arranged in a centered layout.

[0018] As a further embodiment of this utility model: the support is U-shaped, with the fixed block and the moving block respectively located on two adjacent sides of the support.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. By designing the support to slide on the base and aligning the sliding direction with the applied tensile force, this fixture automatically adjusts the clamp position. When a tensile force is applied to the copper or aluminum portion of the negative electrode post for a tear test, the support moves the tear point of the clamped negative electrode post towards the line of action of the tensile force. This dynamic compensation ensures that the tear point remains at or near the center of the line of action of the tensile force throughout the tearing process, achieving a centered layout. This design significantly eliminates eccentric loads caused by initial clamping position deviations or uneven force distribution during testing, improving the accuracy, consistency, and repeatability of test results, and more realistically reflecting the tear performance of the material itself.

[0020] 2. By setting a slide rail on the base for the support to slide and install, and clearly specifying that the sliding direction of the support on the slide rail is parallel to the tear path direction (i.e. the expected tensile force direction and the material separation direction), this parallel layout strictly ensures that the compensation movement trajectory of the support is completely along the tensile force axis, avoiding any lateral offset or torsion to the greatest extent, thereby accurately achieving the aforementioned dynamic centering compensation effect, further improving the testing accuracy and the structural reliability of the tooling.

[0021] 3. By clearly distinguishing between a fixed "stationary block" and a movable "moving block," and defining that the moving block can move closer to or further away from the stationary block to form and adjust the clamping area, the clamping action becomes intuitive and easy to operate. The stationary block provides a stable reference surface, which can provide a positioning reference for the placement of the negative terminal in the clamping area, thus achieving auxiliary centering. The moving block allows for flexible adaptation to copper or aluminum parts of different sizes, and the clamping force can be precisely controlled by adjusting the distance between the two.

[0022] 4. The design of the oblong hole fitting onto the pin provides the moving block with a movement space perpendicular to the length direction of the fixed block (clamping surface direction). The fit between the oblong hole and the pin serves both as a guide and prevents movement from getting stuck.

[0023] 5. Building upon the screw-based clamping of the negative terminal post, the pin is further embodied as a bolt. Once the moving block is in place and clamping the negative terminal post, tightening this bolt will cause its head to directly press against the moving block, firmly locking it onto the support. This eliminates any potential gaps within the oblong hole, allowing the moving block, stationary block, and support to form a rigid whole under clamping conditions. This significantly improves the structural rigidity and stability of the fixture under high tear loads, effectively preventing any minute displacement or vibration, and further enhancing testing accuracy.

[0024] 6. The toothed knurled design on the clamping surfaces of the stationary and moving blocks greatly increases the roughness of the contact surfaces. This effectively prevents the copper or aluminum parts from sliding relative to each other in the clamping area, ensuring that the copper or aluminum parts are firmly "bitten" even under high tensile force.

[0025] 7. By setting pull studs that pass through the through hole from bottom to top, a clear and reliable clamping point is provided for external clamps (such as the clamps of a tensile testing machine).

[0026] 8. An adapter block is installed at the bottom of the base, providing clamping points for the clamps. This allows the entire testing fixture to be securely mounted on the tensile testing machine through two clamping points (the pull stud and the adapter block). This two-point fixing method greatly improves the overall rigidity and stability of the fixture during testing, effectively preventing the fixture itself from shaking or tilting, ensuring that the applied tensile force is transmitted along the designed path, reducing test errors, and making the testing process safer and more reliable. Furthermore, the adapter block is positioned along the line of action of the tensile force applied by the pull stud, ensuring that the adapter block, the tear initiation point, and the pull stud are always in a centered layout.

[0027] 9. The support is designed in a U-shape, naturally creating ideal positions for mounting the stationary and moving blocks on both sides (the inner sides of the two arms of the U). The U-shaped structure itself has good bending and torsional stiffness, capable of withstanding the load in tear tests. This layout allows the stationary and moving blocks to be positioned relatively and spatially concentrated, with a clearly defined clamping area, facilitating operator observation and operation (such as tightening screws / bolts), while also helping to maintain the structural compactness and overall stability of the entire clamping unit. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of a negative electrode post structure in the prior art; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is an exploded structural diagram of the present invention.

[0030] In the diagram: 101, copper section; 102, aluminum section; a, tear start; b, tear end; c, tension point; d, through hole; 1. Base; 2. Support; 3. Slide rail; 4. Fixed block; 5. Moving block; 6. Oval hole; 7. Pin; 8. Screw; 9. Pull stud; 10. Adapter block. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0032] like Figures 2-3 As shown, a tear test fixture for a negative electrode post includes a base 1 and a clamp slidably mounted on the base 1. The clamp is used to hold and fix the copper portion 101 or aluminum portion 102 of the aluminum-copper negative electrode post to be tested. It is important to note that the position of the aluminum-copper negative electrode post on the clamp must ensure that its tear path is arranged along the sliding direction of the clamp. Then, an external clamping component is used to hold the aluminum portion 102 or copper portion 101. At this time, both the copper portion 101 and the aluminum portion 102 of the aluminum-copper negative electrode post are in a clamped and limited state, allowing for subsequent tear testing. There are three tear test methods: (1) Fix the position of the clamp and make the clamping parts tear; (2) Fix the position of the clamping component and make the clamp tear; (3) Make the clamp and the clamping parts perform synchronous tearing actions in opposite directions.

[0033] Taking the third test method as an example, the aluminum part 102 of the aluminum-copper negative electrode post is clamped and limited by a fixture, and the copper part 101 is clamped and limited by a clamping component. Since the copper part 101 has a through hole d, a pull pin 9 is provided. The pull pin 9 passes through the through hole d from bottom to top. The clamping component clamps and fixes the pull pin 9, thus achieving the clamping and limiting of the copper part 101. At this time, the pull pin 9 is located at the tearing start point a, and the pull pin 9 and the tearing start point a are centered. Then, the fixture and the clamping component are driven to move towards each other synchronously, so that the tearing action can be performed from the tearing start point a. Since the fixture is slidably set on the base 1, during the tearing process, the tearing point will move towards the straight line position of the tension of the clamping component, always maintaining the tearing point and the tension in a centered layout relationship. This position compensation setting effectively ensures the accuracy of the test results.

[0034] by Figure 2 As shown, the clamp slides horizontally on the base 1, and the clamping component applies a vertical upward pulling force to the pull stud 9. During the tearing process, the tearing path between the copper part 101 and the aluminum part 102 is from left to right. Since the vertical position of the pulling force on the pull stud 9 remains unchanged, the clamp will move from right to left in a positional compensation manner, so that the tearing point is always located in the direction of the pulling force line, ensuring that the tearing point and the pulling force direction are strictly aligned.

[0035] It should be noted that the clamping components can be existing tensile testing equipment, universal tensile testing machines, etc., and the components used to apply the tearing action to the fixture can also be tensile testing equipment, universal tensile testing machines, etc. When a universal tensile testing machine is selected, the two clamps of the universal tensile testing machine can be directly clamped and fixed to the fixture and the pull stud 9 respectively for tear testing.

[0036] To facilitate clamping and fixing of the fixture by the clamps, this application provides an adapter block 10 on the fixture for clamping by the clamps. Preferably, the adapter block 10 is centered on the position of the pull stud 9 on the fixture. Figure 2 As shown, the rivet 9, the tear start point a, and the adapter block 10 are arranged along the same vertical direction and are centered. During the subsequent tear test, the tear point will dynamically compensate and move to the line connecting the rivet 9 and the adapter block 10, so that the three will always maintain a centered layout.

[0037] Regarding the sliding arrangement of the clamp on the base 1, a slide rail 3 can be provided on the base 1, and the clamp is slidably mounted on the slide rail 3. It should be noted that the function of the slide rail 3 is to provide positional compensation for the clamp along the tear path direction, ensuring that the tear point is always located between the pull stud 9 and the adapter block 10. Therefore, the positional layout of the slide rail 3 can have various forms, as long as it provides sufficient displacement for the clamp to move along the tear path direction. Figure 2 As shown, preferably, the sliding direction of the clamp on the slide rail 3 is set to be parallel to the tear path direction. Under this horizontal layout, the slide rail 3 can provide the clamp with maximum position compensation.

[0038] The clamp described above includes a support 2 and two clamping blocks mounted on the support 2. The support 2 is slidably mounted on a slide rail 3, and the support 2 has a U-shaped layout. The two clamping blocks are arranged opposite each other and are respectively located on two adjacent sides of the support 2. One clamping block is defined as a fixed block 4, and the other is a movable block 5. The fixed block 4 is fixedly mounted on the support 2, and the movable block 5 is slidably mounted on the support 2. The movable block 5 can move towards or away from the fixed block 4 to form an adjustable clamping area between the movable block 5 and the fixed block 4. This clamping area is used to clamp and fix the copper part 101 or aluminum part 102 of the negative electrode post. At the same time, the support 2 is also provided with a screw 8. When the clamping area comes into contact with the copper part 101 or aluminum part 102 of the negative electrode post, the screw 8 is driven to tighten, applying a contacting action to the movable block 5, thereby achieving the clamping and fixing of the copper part 101 or aluminum part 102 of the negative electrode post by the clamping area. like Figure 2 As shown, preferably, the screw 8 is horizontally positioned on the side of the support 2.

[0039] For the sliding arrangement of the moving block 5 on the support 2, a pin 7 can be provided on the support 2, and a waist-shaped hole 6 is provided on the moving block 5. The length direction of the waist-shaped hole 6 is perpendicular to the length direction (clamping surface direction) of the fixed block 4. The moving block 5 is sleeved on the outside of the pin 7 by relying on the waist-shaped hole 6, and the layout of the waist-shaped hole 6 enables the moving block 5 to move closer to or away from the fixed block 4.

[0040] Furthermore, since the screw 8 limits the position of the moving block 5 in the horizontal direction, in order to maintain the stable clamping state of the moving block 5 on the support 2 during the tearing process, this application also includes a bolt for vertically limiting the moving block 5. After the moving block 5 is horizontally pressed against the screw 8, the threaded section of the bolt is passed through the moving block 5 from top to bottom and threaded onto the support 2 until the head of the bolt presses and locks the moving block 5, ensuring the vertical stability of the moving block 5 in the clamping state.

[0041] In order to save costs and refine the structure, this application uses the pin 7 and the bolt as one. That is, the pin 7 serves as a carrier for the oblong hole 6 to be fitted, and can also lock the moving block 5 vertically after the screw 8 makes the moving block 5 horizontally contact.

[0042] In order to ensure that the clamping area can effectively clamp and fix the copper part 101 or aluminum part 102 of the negative terminal post, this application can make the adjacent sides of the fixed block 4 and the moving block 5 have a toothed knurled design, or friction plates can be provided on the adjacent sides of the fixed block 4 and the moving block 5.

[0043] In one specific embodiment, the clamping region clamps the aluminum portion 102 of the negative electrode post, for example... Figure 2 The image shows the clamping area clamping the aluminum portion 102 of the negative electrode post.

[0044] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A negative electrode post tearing test fixture, characterized in that, The device includes a base (1) and a clamp on the base (1). The clamp includes a support (2) on the base (1). The support (2) has two sets of clamping blocks arranged opposite to each other. The two clamping blocks can move relative to each other to create a clamping area that is adjustable in size and used to clamp the copper part (101) or the aluminum part (102). The support (2) is designed to slide on the base (1). When a tensile force is applied to the aluminum part (102) or the copper part (101), the support (2) can drive the tear point to move in the direction of the tensile force line.

2. The negative electrode post tear test fixture according to claim 1, characterized in that, The base (1) is provided with a slide rail (3) for sliding installation of the support (2), and the sliding direction of the support (2) on the slide rail (3) is parallel to the tear path direction.

3. A negative electrode post tear test fixture according to claim 1 or 2, characterized in that, The two clamping blocks are defined as a fixed block (4) and a moving block (5), respectively. The fixed block (4) is fixedly installed on the support (2), and the moving block (5) is movably installed on the support (2). The moving block (5) can move toward or away from the fixed block (4) to form the clamping area.

4. The negative electrode post tear test fixture according to claim 3, characterized in that, The movable block (5) has a waist-shaped hole (6) and the movable block (5) is fitted onto the outside of the pin (7) on the support (2) by relying on the waist-shaped hole (6). The length direction of the waist-shaped hole (6) is perpendicular to the length direction of the fixed block (4) so ​​that the movable block (5) has a range of motion to move toward or away from the fixed block (4).

5. The negative electrode post tear test fixture according to claim 4, characterized in that, The support (2) is provided with screws (8) so that when the moving block (5) and the fixed block (4) are in contact with the copper part (101) or the aluminum part (102) on the same side, the screws (8) can tighten to apply a force to the moving block (5) towards the fixed block (4), so that the moving block (5) presses the copper part (101) or the aluminum part (102) against the fixed block (4).

6. The negative electrode post tear test fixture according to claim 5, characterized in that, The pin (7) is configured as a bolt threaded onto the support (2) so that when the moving block (5) presses the copper part (101) or aluminum part (102) against the fixed block (4), the bolt can be tightened to lock the moving block (5) onto the support (2) by its head.

7. The negative electrode post tear test fixture according to claim 3, characterized in that, The adjacent sides of the fixed block (4) and the moving block (5) are both designed with toothed knurling.

8. A negative electrode post tear test fixture according to claim 1 or 2, characterized in that, The test fixture also includes pull studs (9) that can be inserted from bottom to top into the through holes of the copper part (101), and the pull studs (9) are used for clamping and fixing with clamps.

9. The negative electrode post tear test fixture according to claim 8, characterized in that, The test fixture also includes an adapter block (10) installed at the bottom of the base (1). The adapter block (10) is used for clamping and fixing by another clamp. The adapter block (10), the tear start (a) and the line of action of the tensile force are arranged in a centered position.

10. The negative electrode post tear test fixture according to claim 3, characterized in that, The support (2) is U-shaped, with the fixed block (4) and the moving block (5) located on the two near sides of the support (2).

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